Big God is what I call an “Identifier” song, used in concert to help the audience identify with the common experiences, questions, and emotions that everyone goes through.
What is Life Like? Here's a silly/serious look at that question.
"Nice Guy" is being sung by an imaginary character who is expressing his philosophy of life to his girlfriend. Despite the fact that it’s a few years old, it also seems quite suitable for many people today.
"Maybe It's Jesus" is a "back-door" approach to presenting the Good News about Jesus.